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LCD Monitor Mod backlight control

Discussion in 'LEDs and Optoelectronics' started by electrikbill, Apr 30, 2011.

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  1. electrikbill


    Apr 30, 2011
    I turned my iMac G5 into a computer monitor, except when the computer puts the monitor to sleep, the backlight stays on. I am using a DVI cable to connect from the monitor to the computer. I need a circuit that will detect when a video signal is present that will control the output to the inverter board ON/OFF input. I'm not very familiar with Digital video signals or how to detect them.

    Thank you in advance.

    Attached Files:

  2. leggot


    Mar 28, 2012
    Imac G5 LCD Inverter Pin Out

    I am currently attempting the same project as you did. I have a iMac G5 (EMC:1989) and I believe that it uses the same inverter as you have. I think the pinouts for the inverter are as follows:

    Pin 6 = GROUND (-)
    Pin 5 = 3.0v(+)
    Pin 4 = GROUND (-)
    Pin 3 = 2.1v - 5.09v(Controls Brightness)
    Pin 2 = GROUND (-)
    Pin 1 = 12.2v(+)

    If you can confirm these pinouts it would be great. I am having trouble getting my backlight to turn on.

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